The rules are a pain in the ass for now, bud doable for most. However that could change quickly.
They could raise the 800k to 2 million, and not grandfather those here.
They could change the 400K to 1 million, and not grandfather it.
They could change retirement age for visa/extension to 65, no exceptions!
Before 1997 a Thai woman could not own land (even family property) if married to foreigner.
I don't expect any of these changes, but who knows anymore.